CSS shapes support in Web Inspector

Source/core/inspector/InspectorOverlay.cpp

Index: Source/core/inspector/InspectorOverlay.cpp
diff --git a/Source/core/inspector/InspectorOverlay.cpp b/Source/core/inspector/InspectorOverlay.cpp
index 2d1b2246b0f473052f95333a02937068d089d86b..0eb2753068a8540f756f30a82a25c2036171d17a 100644
--- a/Source/core/inspector/InspectorOverlay.cpp
+++ b/Source/core/inspector/InspectorOverlay.cpp
@@ -495,7 +495,101 @@ static PassRefPtr<JSONObject> buildObjectForSize(const IntSize& size)
     return result.release();
 }
 
-static void setElementInfo(RefPtr<JSONObject>& highlightObject, Node* node)
+// CSS shapes
+struct PathApplyInfo {
+    FrameView* rootView;
+    FrameView* view;
+    JSONArray* array;
+    RenderObject* renderer;
+    const ShapeOutsideInfo* shapeOutsideInfo;
+};
+
+static void appendPathCommandAndPoints(PathApplyInfo* info, const String& command, const FloatPoint points[], unsigned length)
+{
+    FloatPoint point;
+    info->array->pushString(command);
+    for (unsigned i = 0; i < length; i++) {
+        point = info->shapeOutsideInfo->shapeToRendererPoint(points[i]);
+        point = info->view->contentsToRootView(roundedIntPoint(info->renderer->localToAbsolute(point))) + info->rootView->scrollOffset();
+        info->array->pushNumber(point.x());
+        info->array->pushNumber(point.y());
+    }
+}
+
+static void appendPathSegment(void* info, const PathElement* pathElement)
+{
+    PathApplyInfo* pathApplyInfo = static_cast<PathApplyInfo*>(info);
+    FloatPoint point;
+    switch (pathElement->type) {
+    // The points member will contain 1 value.
+    case PathElementMoveToPoint:
+        appendPathCommandAndPoints(pathApplyInfo, "M", pathElement->points, 1);
+        break;
+    // The points member will contain 1 value.
+    case PathElementAddLineToPoint:
+        appendPathCommandAndPoints(pathApplyInfo, "L", pathElement->points, 1);
+        break;
+    // The points member will contain 3 values.
+    case PathElementAddCurveToPoint:
+        appendPathCommandAndPoints(pathApplyInfo, "C", pathElement->points, 3);
+        break;
+    // The points member will contain 2 values.
+    case PathElementAddQuadCurveToPoint:
+        appendPathCommandAndPoints(pathApplyInfo, "Q", pathElement->points, 2);
+        break;
+    // The points member will contain no values.
+    case PathElementCloseSubpath:
+        appendPathCommandAndPoints(pathApplyInfo, "Z", 0, 0);
+        break;
+    }
+}
+
+PassRefPtr<JSONObject> InspectorOverlay::buildObjectForShapeOutside()
+{
+    Node* node = m_highlightNode.get();
+    RenderObject* renderer = node->renderer();
+    if (renderer && renderer->isBox()) {
+        LocalFrame* containingFrame = node->document().frame();
+        RenderBox* renderBox = toRenderBox(renderer);
+
+        const ShapeOutsideInfo* shapeOutsideInfo = renderBox->shapeOutsideInfo();
+        if (!shapeOutsideInfo)
+            return nullptr;
+
+        RefPtr<JSONObject> shapeObject = JSONObject::create();
+        LayoutRect shapeBounds = shapeOutsideInfo->computedShapePhysicalBoundingBox();
+        FloatQuad shapeQuad = renderBox->localToAbsoluteQuad(FloatRect(shapeBounds));
+        FrameView* mainView = containingFrame->page()->mainFrame()->view();
+        FrameView* containingView = containingFrame->view();
+        contentsQuadToPage(mainView, containingView, shapeQuad);
+        shapeObject->setArray("bounds", buildArrayForQuad(shapeQuad));
+
+        Shape::DisplayPaths paths;
+        shapeOutsideInfo->computedShape().buildDisplayPaths(paths);
+
+        if (paths.shape.length()) {
+            RefPtr<JSONArray> shapePath = JSONArray::create();
+            PathApplyInfo info;
+            info.rootView = mainView;
+            info.view = containingView;
+            info.array = shapePath.get();
+            info.renderer = renderBox;
+            info.shapeOutsideInfo = shapeOutsideInfo;
+            paths.shape.apply(&info, &appendPathSegment);
+            shapeObject->setArray("shape", shapePath.release());
+            if (paths.marginShape.length()) {
+                shapePath = JSONArray::create();
+                info.array = shapePath.get();
+                paths.marginShape.apply(&info, &appendPathSegment);
+                shapeObject->setArray("marginShape", shapePath.release());
+            }
+        }
+        return shapeObject.release();
+    }
+    return nullptr;
+}
+
+static void setElementInfo(RefPtr<JSONObject>& highlightObject, RefPtr<JSONObject>& shapeObject, Node* node)
 {
     RefPtr<JSONObject> elementInfo = JSONObject::create();
     Element* element = toElement(node);
@@ -537,6 +631,8 @@ static void setElementInfo(RefPtr<JSONObject>& highlightObject, Node* node)
     RenderBoxModelObject* modelObject = renderer->isBoxModelObject() ? toRenderBoxModelObject(renderer) : 0;
     elementInfo->setString("nodeWidth", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetWidth(), modelObject) : boundingBox.width()));
     elementInfo->setString("nodeHeight", String::number(modelObject ? adjustForAbsoluteZoom(modelObject->pixelSnappedOffsetHeight(), modelObject) : boundingBox.height()));
+    if (renderer->isBox() && shapeObject)
+        elementInfo->setObject("shapeOutsideInfo", shapeObject.release());
     highlightObject->setObject("elementInfo", elementInfo.release());
 }
 
@@ -553,10 +649,11 @@ void InspectorOverlay::drawNodeHighlight()
         highlight.quads.append(eventTargetHighlight.quads[1]); // Add border from eventTargetNode to highlight.
     }
     RefPtr<JSONObject> highlightObject = buildObjectForHighlight(highlight);
+    RefPtr<JSONObject> shapeObject = buildObjectForShapeOutside();
 
     Node* node = m_highlightNode.get();
     if (node->isElementNode() && !m_omitTooltip && m_nodeHighlightConfig.showInfo && node->renderer() && node->document().frame())
-        setElementInfo(highlightObject, node);
+        setElementInfo(highlightObject, shapeObject, node);
     evaluateInOverlay("drawNodeHighlight", highlightObject);
 }